Stationary Engineer Exam Study Guide
Questions And Answers Verified 100%
Correct
What is the minimum clearance required when a boilers capacity is 5 000btus hr over
1000sq ft heating surface or an imput over 5 000 000 btus hr? - ANSWER 7 feet
Under what code are oil fired boilers and their control systems covered? - ANSWER
O.F.B 726
A data plate has what information?? - ANSWER manufacturer - model serial number -
stamp of approval
When working in a boiler work permits should be aquired when? - ANSWER For Each
Shift
ASME code requires that a LWCO control be tested by evaporation how often?? -
ANSWER Monthly
ASME CSD1 requires the main gas burner to have what? - ANSWER 2 manual shutoff
valves. pg 81 1004.1 code book
A HYDROSTATIC test is done at what pressure? - ANSWER 1.5 times the MAWP or
50% over MAWP
How many low water cutoff are needed per code on a hot water system? - ANSWER
One LWCO is needed when the boiler input is greater than 400 000 btus
What gages are on a steam boiler? - ANSWER pressure gage - water gage glass
What gages are on a HW boiler? - ANSWER pressure - Temp
Name three types of low water cutoffs. - ANSWER 1. float magnetic (rod to magnet to
mercury switch) 2. Float linkage- link to mercury switch 3. Submerged electrode- water
Boilers having more than 500square feet of heating surface should have how many
means of feed water? - ANSWER 2
Types of FEEDWATER REGULATORS - ANSWER 1.Thermostatic mechanical
regulator 2. Thermostatic fluid style 3. Float operated style
,Name two types of commonly used feedwater pumps - ANSWER Injector and Inspirator
What piping arrangment is used to return condensate from steam lines and steam
seperators? - ANSWER HOLLYLOOP
What would happen if high temp liquid passes through a centrifugal pump? - ANSWER
WIRE DRAWING
A multi stage pump can be either __________ or_______ ? - ANSWER Volute or
Diffuser
To prevent cavitation most pumps are stamped with the ____ _______ _______ ____ ?
- ANSWER NET POSITIVE SUCTION HEAD
What are two types of condensate return systems?? - ANSWER a.) Mechanical Return ;
uses steam traps and pumps to aid return b.) Gravity Return System : uses gravity
TO PREVENT THE SUPERHEATER FROM OVERHEATING ON START UP WHAT
SHOULD YOU DO - ANSWER EITHER FLOOD THE TUBES WITH WATER OR THE
SUPERHEATER SHOULD BE VENTED TO THE ATMOSPHERE BY A FREE BLOW
VALVE UNTIL THE BOILER GOES ON LINE.
What device acts as a check valve in both directions and keeps the pump primmed? -
ANSWER FOOT VALVES ARE USED ON PUMPS UNDER SUCTION PRESSURE
AND PREVENT FLOW ON SUCTION LINE
WHAT PUMP HAS A WATER PISTON DIRECTLY CONNECTED TO A STEAM
DRIVEN PISTON VIA A ROD? - ANSWER RECIPRICATING
What causes a piston type trap to open? - ANSWER cold condensate (on test the
steam psi drop and temp drop was used)
Quickly opening a steam valve will cause _______ ________ . - ANSWER water
hammer
What mechanical device removes scale from a watertube boiler? - ANSWER a tube
turbine
What causes blistering? - ANSWER A slag inclusion forming a lamination at the time
the plate was rolled in the steel mill and it's actually a seperation of metal from the shell
plate caused by impurities rolled into the shellplate when it was formed.
To internally remove oxygen from the boiler use______ ________ . - ANSWER Sodium
,Sulfite
A positioning control system is used on a ______ ________ - ANSWER a process
boiler
A saybolt universal is a - ANSWER measurement of viscosity
Creep gets worse with _______________ __________ - ANSWER elevated temps
What type of valve WOULD NOT be a good choice if sediment were present - ANSWER
GLOBE
How many btus does it take to take 10 lbs of steam from 40 to 41 degrees - ANSWER
10 btus 1btu=1lb
What is it called when you let a peice of equipment fail before you repair/replace it? -
ANSWER Breakdown maintenance
What percent of blistering or buldging is ok? - ANSWER 2%
What kind of boiler are staybolts found on? - ANSWER Fire tube boilers
A 8 foot length of tube or shell can take up to ___% sag or bend and still be used
without replacing? - ANSWER 2%
What does a low water cutoff do in a low water condition? - ANSWER Shuts off fuel
supply
What is the first indication of a low water condition - ANSWER A red hot crown sheet
If a boiler exceeds 100psi it must have how many blowdowns? - ANSWER 2
What is the appropriate test for checking porosity of the metal? - ANSWER PULSE
ECHO ( A TYPE OF ULTRASONIC)
What chemicals are used to combat corrosion? - ANSWER Sodium Sulfite; hydrazine;
catalied hydrazine
If your boiler water has a PH of .5 what compound type do you add to neutralize it? -
ANSWER BASES - THEY REACT WITH ACIDS TO FORM A SALT
What level of deionized water alkalinityis permitted for a 600 psi boiler? - ANSWER 250
PPM
, What can oxygen cause in a system - ANSWER PITTING CORROSION
In a vertical boiler where is the first place to check for thinning tubes? - ANSWER
WATER LEGS especially at the bottom or on the combustion side at the upper ends of
the tubes.
What produces soft scale? - ANSWER Calcium and magnesium carbonate and
magnesium clorine
Hideout in a boiler causes what to precipitate? - ANSWER Sodium phosphate
What is main cause of a generating tube failure? - ANSWER overheating at the lower
tubes due to scale sludge and poor circulation
What refrigerant is flammable and non toxic ? - ANSWER Propane
What refrigerant class is Ammonia R 717? - ANSWER B2
What is the purpose of a condensor in a refrigerant system? - ANSWER to bring
refrigerant to a liquid state
Why is oil in a refrigerating system? - ANSWER lubricates and cools compressor
How is moisture removed from a refrigerant system? - ANSWER filter dryer
What type of gas DONT you use to leak test an AC system? - ANSWER OXYGEN
What is the maximum voltage on a boiler control circuit? - ANSWER 150 VOLTS
A fuel oil that has an API of 32 has how many btus per lb of heating? - ANSWER 19490
Which fuel oils need heating? - ANSWER #4;#5;#6
What size pipe is used as a header in a boiler operating at 100 psi? - ANSWER 6
inches
What function can an operator contribute towards boiler function? - ANSWER saftey -
efficiency - log plant readings
How is heat transferred in a boiler ? - ANSWER CONVECTION - CONDUCTION -
RADIATION
What is not an organic sludge conditioner? - ANSWER Amines
Questions And Answers Verified 100%
Correct
What is the minimum clearance required when a boilers capacity is 5 000btus hr over
1000sq ft heating surface or an imput over 5 000 000 btus hr? - ANSWER 7 feet
Under what code are oil fired boilers and their control systems covered? - ANSWER
O.F.B 726
A data plate has what information?? - ANSWER manufacturer - model serial number -
stamp of approval
When working in a boiler work permits should be aquired when? - ANSWER For Each
Shift
ASME code requires that a LWCO control be tested by evaporation how often?? -
ANSWER Monthly
ASME CSD1 requires the main gas burner to have what? - ANSWER 2 manual shutoff
valves. pg 81 1004.1 code book
A HYDROSTATIC test is done at what pressure? - ANSWER 1.5 times the MAWP or
50% over MAWP
How many low water cutoff are needed per code on a hot water system? - ANSWER
One LWCO is needed when the boiler input is greater than 400 000 btus
What gages are on a steam boiler? - ANSWER pressure gage - water gage glass
What gages are on a HW boiler? - ANSWER pressure - Temp
Name three types of low water cutoffs. - ANSWER 1. float magnetic (rod to magnet to
mercury switch) 2. Float linkage- link to mercury switch 3. Submerged electrode- water
Boilers having more than 500square feet of heating surface should have how many
means of feed water? - ANSWER 2
Types of FEEDWATER REGULATORS - ANSWER 1.Thermostatic mechanical
regulator 2. Thermostatic fluid style 3. Float operated style
,Name two types of commonly used feedwater pumps - ANSWER Injector and Inspirator
What piping arrangment is used to return condensate from steam lines and steam
seperators? - ANSWER HOLLYLOOP
What would happen if high temp liquid passes through a centrifugal pump? - ANSWER
WIRE DRAWING
A multi stage pump can be either __________ or_______ ? - ANSWER Volute or
Diffuser
To prevent cavitation most pumps are stamped with the ____ _______ _______ ____ ?
- ANSWER NET POSITIVE SUCTION HEAD
What are two types of condensate return systems?? - ANSWER a.) Mechanical Return ;
uses steam traps and pumps to aid return b.) Gravity Return System : uses gravity
TO PREVENT THE SUPERHEATER FROM OVERHEATING ON START UP WHAT
SHOULD YOU DO - ANSWER EITHER FLOOD THE TUBES WITH WATER OR THE
SUPERHEATER SHOULD BE VENTED TO THE ATMOSPHERE BY A FREE BLOW
VALVE UNTIL THE BOILER GOES ON LINE.
What device acts as a check valve in both directions and keeps the pump primmed? -
ANSWER FOOT VALVES ARE USED ON PUMPS UNDER SUCTION PRESSURE
AND PREVENT FLOW ON SUCTION LINE
WHAT PUMP HAS A WATER PISTON DIRECTLY CONNECTED TO A STEAM
DRIVEN PISTON VIA A ROD? - ANSWER RECIPRICATING
What causes a piston type trap to open? - ANSWER cold condensate (on test the
steam psi drop and temp drop was used)
Quickly opening a steam valve will cause _______ ________ . - ANSWER water
hammer
What mechanical device removes scale from a watertube boiler? - ANSWER a tube
turbine
What causes blistering? - ANSWER A slag inclusion forming a lamination at the time
the plate was rolled in the steel mill and it's actually a seperation of metal from the shell
plate caused by impurities rolled into the shellplate when it was formed.
To internally remove oxygen from the boiler use______ ________ . - ANSWER Sodium
,Sulfite
A positioning control system is used on a ______ ________ - ANSWER a process
boiler
A saybolt universal is a - ANSWER measurement of viscosity
Creep gets worse with _______________ __________ - ANSWER elevated temps
What type of valve WOULD NOT be a good choice if sediment were present - ANSWER
GLOBE
How many btus does it take to take 10 lbs of steam from 40 to 41 degrees - ANSWER
10 btus 1btu=1lb
What is it called when you let a peice of equipment fail before you repair/replace it? -
ANSWER Breakdown maintenance
What percent of blistering or buldging is ok? - ANSWER 2%
What kind of boiler are staybolts found on? - ANSWER Fire tube boilers
A 8 foot length of tube or shell can take up to ___% sag or bend and still be used
without replacing? - ANSWER 2%
What does a low water cutoff do in a low water condition? - ANSWER Shuts off fuel
supply
What is the first indication of a low water condition - ANSWER A red hot crown sheet
If a boiler exceeds 100psi it must have how many blowdowns? - ANSWER 2
What is the appropriate test for checking porosity of the metal? - ANSWER PULSE
ECHO ( A TYPE OF ULTRASONIC)
What chemicals are used to combat corrosion? - ANSWER Sodium Sulfite; hydrazine;
catalied hydrazine
If your boiler water has a PH of .5 what compound type do you add to neutralize it? -
ANSWER BASES - THEY REACT WITH ACIDS TO FORM A SALT
What level of deionized water alkalinityis permitted for a 600 psi boiler? - ANSWER 250
PPM
, What can oxygen cause in a system - ANSWER PITTING CORROSION
In a vertical boiler where is the first place to check for thinning tubes? - ANSWER
WATER LEGS especially at the bottom or on the combustion side at the upper ends of
the tubes.
What produces soft scale? - ANSWER Calcium and magnesium carbonate and
magnesium clorine
Hideout in a boiler causes what to precipitate? - ANSWER Sodium phosphate
What is main cause of a generating tube failure? - ANSWER overheating at the lower
tubes due to scale sludge and poor circulation
What refrigerant is flammable and non toxic ? - ANSWER Propane
What refrigerant class is Ammonia R 717? - ANSWER B2
What is the purpose of a condensor in a refrigerant system? - ANSWER to bring
refrigerant to a liquid state
Why is oil in a refrigerating system? - ANSWER lubricates and cools compressor
How is moisture removed from a refrigerant system? - ANSWER filter dryer
What type of gas DONT you use to leak test an AC system? - ANSWER OXYGEN
What is the maximum voltage on a boiler control circuit? - ANSWER 150 VOLTS
A fuel oil that has an API of 32 has how many btus per lb of heating? - ANSWER 19490
Which fuel oils need heating? - ANSWER #4;#5;#6
What size pipe is used as a header in a boiler operating at 100 psi? - ANSWER 6
inches
What function can an operator contribute towards boiler function? - ANSWER saftey -
efficiency - log plant readings
How is heat transferred in a boiler ? - ANSWER CONVECTION - CONDUCTION -
RADIATION
What is not an organic sludge conditioner? - ANSWER Amines
